JPS622984Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a hydraulic actuator 8 that drives the reaping section 4 up and down relative to the traveling vehicle body, a ground sensor 13 that detects the height of the reaping section 4 from the ground, and a control valve for the hydraulic actuator 8. V is operated based on the detection result of the ground sensor 13,
The control valve V is controlled through a control mechanism 23 that adjusts the height of the reaping section 4 above the ground within a set range, and flexibility mechanisms 41 and 42 that have flexibility corresponding to the amount of operation of the control valve V by the control mechanism 23. A manual operation tool 35 operably connected to the
and a posture switching mechanism 28 for switching the ground sensor 13 between an operating position and a storage position.

In the above method, when there is a locally raised part in the field during the cutting height control state,
The structure is such that the reaping section can be forcibly raised by operating beyond the flexible range. Conventionally, the above-mentioned flexibility range has been applied even when the cutting height is adjusted by manual lifting and lowering operations without using a sensor, such as when cutting horizontally orthogonally to the rows or when the field conditions are poor. The reaping section was being raised and lowered by operations exceeding the height.

However, in raising and lowering the reaping section, which relies solely on manual operation, an additional operation is required to cover the flexible range, and the operation stroke is large, making it difficult to perform the raising and lowering operations on the reaping section.

In consideration of the above, the present invention aims to make it possible to raise and lower the cutting unit manually with a small operating stroke, and to make it possible to easily and reliably obtain this state without any operation when switching from the automatic cutting height control state.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A reaping section 4 consisting of a pulling device 1, a reaping device 2, and a conveying device 3 is mounted on a traveling vehicle body equipped with a threshing device 6 for threshing grain culms conveyed by a feed chain 5 and a control section 7, using hydraulic pressure. A combine harvester is constructed by being provided so as to be able to freely swing up and down and be driven via a single-acting hydraulic cylinder 8 as an example of an actuator.

A support bracket 1 is attached to the frame 9 of the reaping section 4.
As shown in FIGS. 2 and 3, mounting members 11, 11 and a wire receiving member 12 are provided on the support bracket 10, and the mounting member 1
Ground contact type sensors 13 are individually pivotally connected to the sensor 1 so as to be swingable.

To configure the control valve V for the hydraulic cylinder 8, as shown in FIG. 4, a spool 15 for ascending operation and a spool 16 for descending operation are provided in the valve body 14 so as to be slidable, respectively.
Compression spring 1 on both spools 15 and 16 respectively
7 and 17 are attached so that the cylinder 8 can be maintained in a vertically stopped state in a non-operating state.

An operation piece 18 for operating the spools 15 and 16 by contacting the spools 15 and 16 is connected to a support shaft 19, and the support shaft 19
is rotatably provided on the frame 20 to which the valve V is attached, and a linking bracket 21 is rotatably attached to the end of the support shaft 19, and the linking bracket 21 and the sensor 13 are connected via a release wire 22. The control valve V is operated as the sensor 13 swings up and down with respect to the mounting member 11, and the height of the reaping section 4 above the ground is automatically set within a setting range based on the height above the ground detected by the sensor 13. The cutting height control mechanism 23 is configured to maintain the cutting height within the range.

Reference numerals 24 and 24 in the figure are tension springs that urge the sensors 13 and 13 to swing downwardly with respect to the mounting members 11 and 11, and
In the figure, reference numeral 25 denotes a tensioner attached to the interlocking bracket 21 in order to rotate the operation piece 18 to the upward operation side when the sensor 13 swings upward with respect to the mounting member 11 and the release wire 22 is loosened. It is a tension spring installed.

Linkage bracket 21 for the release wire 22
On the side, the receiving member 2 of the outer wire 22a
6 is pivotally connected to an operating tool 27 that is swingably mounted around the horizontal axis X, and the receiving member 26
Control valve V
The sensors 13, 13 are swung relative to the mounting member 11 without operating the frame 9, and the sensors 13, 13 are protruded downward to a greater extent than the frame 9, resulting in a high mowing condition, and a low mowing condition, in which the sensors 13, 13 protrude smaller than the frame 9. The switching mechanism is configured to change the set cutting height between the two states and to switch to a non-working position for storing, which swings upward more than the working position for reaping and hardly protrudes from the frame 9. It consists of 28.

An angled bracket 29 is provided to be able to swing integrally with the outer wire receiving member 26, and
A release wire 32 is connected to the angle bracket 29 and a U-shaped bracket 31 which pivotably connects the middle of a spring mounting member 30 to which the ends of the tension springs 24, 24 are attached to the sensor 13. Sensor 1 is connected via the
The configuration is such that the downward biasing force applied to No. 3 is not changed.

In order to support the support shaft 19 on the frame 20,
A boss member 33 is fitted onto the support shaft 19 so as to be relatively rotatable.
A lever portion 34 is connected to one end of the boss member 33, and the lever portion 34 and a manual lifting/lowering operation lever 35 are interlocked and connected via a link 36. A plate body 37 is rotatably attached to the other end of the boss member 33, and as shown in FIG.
On the other hand, the recess 38 is formed in the frame 20.
A ball 39 to be fitted into the boss member 3 is provided in a state where it is biased toward the fitting side by a compression spring 40.
3 is rotated by the lever 35, and the fixing mechanism 43 is configured to be fixed at a third position for automatic elevation control to be described later by the biasing force of a spring 40.

A pair of notch grooves 4 each having a predetermined width in the circumferential direction are provided at the end of the boss member 33 opposite to the lever portion 34 with a phase difference of 180° in the circumferential direction.
1, 41, and the pin 42 attached to the support shaft 19 is engaged in the notched grooves 41, 41, and with the manual lifting operation lever 35 fixed, the notched grooves 41, 41 are inserted.
The operating piece 18 is configured to be operated within a range within which movement of the pin 42 is permitted.

Next, a description will be given of the operating state in which the manual elevating operation lever 35 is positioned at each of the first to fourth positions P ₁ , P ₂ , P ₃ , and P ₄ .

That is, as shown in FIG.
At position P ₁ , the pin 42 of the boss member 33
The support shaft 19 is forcibly rotated by contact with the sensor 13, and only the lifting operation spool 15 is operated.
The reaping section 4 is forcibly raised regardless of the displacement. In addition, as shown in FIG.
At position _P2 , with the reaping part 4 raised to the non-working area, the notch groove 4 in the boss member 33 is
1 - By contacting the pin 42 with the side wall, the sensor 1
3 prevents the support shaft 19 from rotating toward the side that operates the descending operation spool 16,
This is to maintain the raised state of the reaping section 4. or,
As shown in Fig. 6C, the manual lift operation lever 3
At a third position P3, in which the sensor 5 is swung from the second position _P2 to the side opposite to the _first position _P1 , the sensor 1
3, both spools 15 and 16 for lifting and lowering operations are selectively operated within the permissible displacement range of the pin 42 relative to the notched grooves 41 and 41, and the ground height of the cutting section 4 is automatically adjusted. The cutting height is controlled to maintain the cutting height within the set range. In addition _, as shown in FIG.
At position P ₄ , even if the reaping section 4 is lowered from the raised state of the non-working area to the working area, and the sensor 13 is in a state of raising the reaping section 4, regardless of the displacement of the sensor 13. First, the reaping section 4 is forcibly lowered.

A coiled spring 44 as an example of a biasing mechanism is interposed between the frame 20 and the lever portion 34, and is configured to swing the lift operation lever 35 back to the second position _P2 and maintain that state. There is. still,
When the fixing mechanism 43 is in the fixed state, it is fixed at the third position _P3 against the biasing force of the coiled spring 44 due to its static frictional force, but when it returns from the fourth position _P4 , the dynamic frictional force of the fixing mechanism 43 is It is configured such that it can overcome this and return to the second position without being fixed at the third position.

As shown in FIG. 4, in the middle of the flow path for communicating and connecting the pump port P and the cylinder side port C of the lifting operation spool 15, as shown in FIGS. 6 and 7, A tapered land 45 is formed to form a rippled flow path.

On the other hand, the lowering operation spool 16 is provided with a valve element 46 which opens and closes a flow path for communicating and connecting the cylinder side port C and the tank port T by contacting and pressing the spool 16, and the valve element 46 is provided with: Within a predetermined movement range, the small-diameter communication hole 47 is formed so that a curving flow path is formed as shown in FIGS. 6 and 7.
...is formed. As described above, the structure of the ridges on both spools 15 and 16 allows the reaping section 4 to be raised and lowered at high speed in each manual lifting operation by human power at the first and fourth positions P ₁ and P ₄ respectively. On the other hand, in the automatic elevation control state at the third position _P3 , the notch grooves 41, 41 If the sensor 13 is displaced by more than the set value, such as when the sensor 13 detects a large bulge and is deviated to the rising side, the reaping part 4 is driven upward at high speed only by the raising operation, and the reaping part 4 reaches the ground. The construction is such that collisions can be reliably avoided.

A coupling pin 48 as an example of a coupling device is provided in the coupling bracket 21 in a slidable manner, and a hole 49 is provided in the lever portion 34 to fit and lock the pin 48 in the second position _P2. By fitting and locking the bracket 21 into the hole 49 of 48, the bracket 21 and the lever portion 34 are directly connected, and both spools 15, 16
It is configured such that it can be operated by a lift operation lever 35.

A compression spring 50 is interposed in the connecting pin 48 to urge the connecting pin 48 to move away from the lever portion 34 .
One end of a coiled spring 51 is connected to the head portion of the switch 8, and the other end of the coiled spring 51 and the angle-shaped bracket 29 are interlocked and connected via a release wire 52. Ingredients 27
As the cutting height is switched from the cutting height setting position to the retracted position, the connecting pin 48 is switched to the connected state against the biasing force of the compression spring 50, the sensor 13 is switched to the retracted state, and the connecting pin 48 is switched to the connected state. The configuration is such that the switching to and from the above are performed all at once.
At this time, even if the lift operation lever 35 is not in the second position P ₂ , the tip of the pin 48 comes into contact with the lever portion 34 while being biased toward the connection side by the coil spring 51 , and the operation lever 35 is moved. As the pin 48 is moved to the second position _P2 , the pin 48 will automatically fit into the hole 49.

An operating piece 1 for linking the sensor 13 and both spools 15 and 16 of the control valve V.
8. The support shaft 19, the linking bracket 21, and the release wire 22 are collectively referred to as a mechanical linking mechanism.

Lifting operation lever 3 for the above mechanical linkage mechanism
In the above embodiment, the lever 35 is directly connected to the
The lever portion 34, which is a member linked to the link bracket 21, is configured to be connected to the link bracket 21.
For example, the operation lever 35 can be directly connected to the bracket 2.
It may also be connected to 1.

The mechanical linkage mechanism and the manual lift operation lever 35
In order to link these within a certain range of flexibility,
The configuration is not limited to the notch grooves 41, 41 and the pin 42 as described above, but for example, the boss member 31 and the support shaft 19.
The frictional resistance in the direction of relative rotation is made different in a predetermined phase between the
Various structural modifications are possible, such as setting it within a flexible range and configuring it so that it rotates integrally without relative rotation due to frictional resistance in a state beyond that range, and by doing so, the flexible mechanism 41 , 42.

In summary, the present invention provides the above-mentioned cutting height control mechanism for the combine harvester.
The present invention is characterized in that a connecting device 48 is provided which directly connects the manual operating tool 35 and the control valve V to the inflexible state in conjunction with the switching to the storage position of No. 3, and its effects are as follows. It is.

In other words, in the automatic cutting height control state, the flexibility mechanism 4
Manual operation tool 35 beyond the range of flexibility provided by 1, 42
By operating the , it is possible to force the reaping part 4 to be raised artificially when there is a localized raised area, etc., and it is also possible to raise and lower the reaping part 4 when mowing on headlands etc. When the reaping section 4 is raised and lowered only by the manual operating tool 35, such as during horizontal mowing, the manual operating tool 35 and the control valve V are directly connected without going through the flexibility mechanisms 41 and 42. The control valve V can be operated in a state where the control valve V is not used, and the reaping part 4 can be raised and lowered with a small operation stroke, and the reaping part 4 can be raised and lowered only manually to perform reaping travel easily and satisfactorily.

In addition, for example, if only the connector 48 is provided, it would be necessary to switch the sensor 13 to the retracted position and connect the connector 48 when reaping only manually. 13 to the retracted position, the connecting tool 48 can be automatically switched to the connected state,
It is now possible to easily and reliably raise and lower the reaping section 4 with a small operating stroke only manually without any accidental forgetting.

[Brief explanation of the drawing]

The drawings show an embodiment of the cutting height control mechanism for a combine harvester according to the present invention. Fig. 1 is a partially omitted side view of the combine, Fig. 2 is a side view of the main part showing the sensor, and Fig. 3 is a cutting height control mechanism for a combine harvester. Perspective view showing the control mechanism, 4th
The figure is a sectional view of the main part of Fig. 3, Fig. 5 is a partially exploded sectional view taken along the - line in Fig. 3, Fig. 6 is an explanatory diagram showing the operating states of the valves, and Fig. 7 is the hydraulic pressure. It is a circuit diagram. 4...Reaping section, 8...Hydraulic actuator, 1
3...Sensor, 23...Mowing height control mechanism, 28
...Switching mechanism, 34...Linking member, 35...Manual operation tool, 41, 42...Accommodation mechanism, 48...Connection tool, V...Control valve.

Claims (1)

[Scope of utility model registration request] A hydraulic actuator 8 that drives the reaping section 4 up and down with respect to the traveling vehicle body, a ground sensor 13 that detects the height of the reaping section 4 from the ground, and a control valve V of the hydraulic actuator 8 based on the detection result of the ground sensor 13. a control mechanism 2 that adjusts the height of the reaping section 4 above the ground within a set range by operating the control mechanism 2;
3, a manual operating tool 35 which connects the control valve V so as to be operable through flexible mechanisms 41 and 42 having flexibility corresponding to the amount of operation of the control valve V by the control mechanism 23, and the ground sensor 13. In a combine cutting height control mechanism including a posture switching mechanism 28 that switches between an operating position and a storage position, the manual operating tool 3
5 and the control valve V in the inflexible state.